Even if some host would offer it for free, the service should be at least acceptable. But it usually isn't. If one offers free lunch to the poor, that food must not be rotten.
All hosts have to pay for the servers, bandwidth and other expenses, so better you search a budget host, i can also recommend you Drupalvaluehosting.com.

i wnt to knw on hw to launch my website in free web hosting..plz any one...guide me..

I would like to suggest you if you are searching for reliable and good web hosting, you should avoid the free web hosting or unlimited plans. Earlier I also used free web hosting but later as I had problem with site uptime, I switched to paid hosting service. I think website is an investment for your business and you should secure this investment with good and reliable host. Always remember an adage "Good host not cheap. Cheap host not good."
Cheers